*4.2. Fuzzy Inference Rules*

The output of the fuzzy logic is determined by defining 25 rules, indicated in Table 1. The fuzzy inference rules are based on the deviation in frequency (Δ*f*) and the amount of reserve (Δ*PWT*). To evaluate the inference rules of the sets, the minimum conjunction operator is used.


**Table 1.** Fuzzy inference rules.

Fast rate is desired if the frequency drop and the amount of reserve of WES are large. If the amount of reserved power of the WES is not large and the ROCOF is small, the low rate is preferred. The fuzzy inference rules are defined to avoid an unnecessary fast rate for very small reserves. The fuzzy inference rules are explained below:

